<template>
    <div style="">

        <table class="mytable">

            <tr><td>click 触发子菜单</td><td>
                <div class="block">
                    <el-cascader
                            v-model="value"
                            :options="options"
                            @change="handleChange"></el-cascader>
                </div>
            </td></tr>

            <tr><td>hover 触发子菜单</td><td>
                <div class="block">
                    <el-cascader
                            v-model="value"
                            :options="options"
                            :props="{ expandTrigger: 'hover' }"
                            @change="handleChange"></el-cascader>
                </div>
            </td></tr>

            <tr><td>仅显示最后一级</td><td>
                <div class="block">
                    <el-cascader
                            v-model="value"
                            :options="options"
                            :show-all-levels="false"
                            :props="{ expandTrigger: 'hover' }"
                            @change="handleChange"></el-cascader>
                </div>
            </td></tr>

            <tr><td>多选</td><td>
                <div class="block">
                    <el-cascader
                            v-model="value"
                            :options="options"
                            :props="multiProps"
                            :show-all-levels="false"
                            @change="handleChange"></el-cascader>
                </div>
            </td></tr>

            <tr><td>懒加载</td><td>
                <div class="block">
                    <el-cascader
                            v-model="value"
                            :props="lazyProps"
                            :show-all-levels="false"
                            @change="handleChange"></el-cascader>
                </div>
            </td></tr>

            <tr><td>可搜索</td><td>
                <div class="block">
                    <el-cascader
                            v-model="value"
                            :show-all-levels="false"
                            :options="options"
                            filterable
                            :props="multiProps"
                            @change="handleChange"></el-cascader>
                </div>
            </td></tr>

            <tr><td>自定义节点内容</td><td>
                <div class="block">
                    <el-cascader :options="options">
                        <template slot-scope="{ node, data }">
                            <span>{{ data.label }}</span>
                            <span v-if="!node.isLeaf"> ({{ data.children.length }}) </span>
                        </template>
                    </el-cascader>
                </div>
            </td></tr>

            <tr><td>级联面板</td><td>
                <div class="block">
                    <el-cascader-panel :options="options"></el-cascader-panel>
                </div>
            </td></tr>

        </table>


    </div>

</template>

<style>
    .mytable {
        width: 100%;
        border: 1px dotted black;
    }

    .mytable tr td {
        border: 1px dotted black;
    }

    .mytable tr td:first-child {
        width: 25%;
    }

    tr {
        counter-reset: section;
    }

    .mytable tr td:first-child:before{
        counter-increment: section;
        /*content: "例子 " counter(section) ". ";*/
    }

    .el-cascader {
        width: 100%;
    }

    .el-cascader-panel.is-bordered {
        background-color: white;
        height: 50%;
    }
</style>

<script>
    let id = 0;

    export default {
        name: "index.vue",
        data() {
            return {
                multiProps: { multiple: true,expandTrigger: 'hover' },
                lazyProps: {
                    lazy: true,
                    lazyLoad (node, resolve) {
                        const { level } = node;
                        setTimeout(() => {
                            const nodes = Array.from({ length: level + 1 })
                                .map(item => ({
                                    value: ++id,
                                    label: `选项${id}`,
                                    leaf: level >= 2
                                }));
                            // 通过调用resolve将子节点数据返回，通知组件数据加载完成
                            resolve(nodes);
                        }, 1000);
                    }
                },
                value: [],
                options: [{
                    value: 'zhinan',
                    label: '指南',
                    children: [{
                        value: 'shejiyuanze',
                        label: '设计原则',
                        children: [{
                            value: 'yizhi',
                            label: '一致'
                        }, {
                            value: 'fankui',
                            label: '反馈'
                        }, {
                            value: 'xiaolv',
                            label: '效率'
                        }, {
                            value: 'kekong',
                            label: '可控'
                        }]
                    }, {
                        value: 'daohang',
                        label: '导航',
                        children: [{
                            value: 'cexiangdaohang',
                            label: '侧向导航'
                        }, {
                            value: 'dingbudaohang',
                            label: '顶部导航'
                        }]
                    }]
                }, {
                    value: 'zujian',
                    label: '组件',
                    children: [{
                        value: 'basic',
                        label: 'Basic',
                        children: [{
                            value: 'layout',
                            label: 'Layout 布局'
                        }, {
                            value: 'color',
                            label: 'Color 色彩'
                        }, {
                            value: 'typography',
                            label: 'Typography 字体'
                        }, {
                            value: 'icon',
                            label: 'Icon 图标'
                        }, {
                            value: 'button',
                            label: 'Button 按钮'
                        }]
                    }, {
                        value: 'form',
                        label: 'Form',
                        children: [{
                            value: 'radio',
                            label: 'Radio 单选框'
                        }, {
                            value: 'checkbox',
                            label: 'Checkbox 多选框'
                        }, {
                            value: 'input',
                            label: 'Input 输入框'
                        }, {
                            value: 'input-number',
                            label: 'InputNumber 计数器'
                        }, {
                            value: 'select',
                            label: 'Select 选择器'
                        }, {
                            value: 'cascader',
                            label: 'Cascader 级联选择器'
                        }, {
                            value: 'switch',
                            label: 'Switch 开关'
                        }, {
                            value: 'slider',
                            label: 'Slider 滑块'
                        }, {
                            value: 'time-picker',
                            label: 'TimePicker 时间选择器'
                        }, {
                            value: 'date-picker',
                            label: 'DatePicker 日期选择器'
                        }, {
                            value: 'datetime-picker',
                            label: 'DateTimePicker 日期时间选择器'
                        }, {
                            value: 'upload',
                            label: 'Upload 上传'
                        }, {
                            value: 'rate',
                            label: 'Rate 评分'
                        }, {
                            value: 'form',
                            label: 'Form 表单'
                        }]
                    }, {
                        value: 'data',
                        label: 'Data',
                        children: [{
                            value: 'table',
                            label: 'Table 表格'
                        }, {
                            value: 'tag',
                            label: 'Tag 标签'
                        }, {
                            value: 'progress',
                            label: 'Progress 进度条'
                        }, {
                            value: 'tree',
                            label: 'Tree 树形控件'
                        }, {
                            value: 'pagination',
                            label: 'Pagination 分页'
                        }, {
                            value: 'badge',
                            label: 'Badge 标记'
                        }]
                    }, {
                        value: 'notice',
                        label: 'Notice',
                        children: [{
                            value: 'alert',
                            label: 'Alert 警告'
                        }, {
                            value: 'loading',
                            label: 'Loading 加载'
                        }, {
                            value: 'message',
                            label: 'Message 消息提示'
                        }, {
                            value: 'message-box',
                            label: 'MessageBox 弹框'
                        }, {
                            value: 'notification',
                            label: 'Notification 通知'
                        }]
                    }, {
                        value: 'navigation',
                        label: 'Navigation',
                        children: [{
                            value: 'menu',
                            label: 'NavMenu 导航菜单'
                        }, {
                            value: 'tabs',
                            label: 'Tabs 标签页'
                        }, {
                            value: 'breadcrumb',
                            label: 'Breadcrumb 面包屑'
                        }, {
                            value: 'dropdown',
                            label: 'Dropdown 下拉菜单'
                        }, {
                            value: 'steps',
                            label: 'Steps 步骤条'
                        }]
                    }, {
                        value: 'others',
                        label: 'Others',
                        children: [{
                            value: 'dialog',
                            label: 'Dialog 对话框'
                        }, {
                            value: 'tooltip',
                            label: 'Tooltip 文字提示'
                        }, {
                            value: 'popover',
                            label: 'Popover 弹出框'
                        }, {
                            value: 'card',
                            label: 'Card 卡片'
                        }, {
                            value: 'carousel',
                            label: 'Carousel 走马灯'
                        }, {
                            value: 'collapse',
                            label: 'Collapse 折叠面板'
                        }]
                    }]
                }, {
                    value: 'ziyuan',
                    label: '资源',
                    children: [{
                        value: 'axure',
                        label: 'Axure Components'
                    }, {
                        value: 'sketch',
                        label: 'Sketch Templates'
                    }, {
                        value: 'jiaohu',
                        label: '组件交互文档'
                    }]
                }]
            };
        },
        methods: {
            handleChange(value) {
                console.log(value);
            }
        }
    }

</script>
